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While I was installing my new sedan mirrors, I noticed an unused 2-pin connector directly beneath the 6-pin mirror connector.

I have a 1999 323i so I don't believe I have the (connected to fuse 57) euro-fold capabilities. However, I tried to plug in the 2-pin wires from my mirrors and they fit perfectly.

There are a total of four connectors in the door. 2 for the speakers (where the blue connector is in the photo), 1 for the side mirror, and the unknown 2-pin connector. The same setup exists on both the passenger and driver's side.

Anyone know what this could possibly be? Tried a search and came up with nothing.